10th, Sci. Part 1, 3. Chemical reactions and equations.

10th, Sci. Part 1, 3. Chemical reactions and equations.

Study of... chemical reactions 2 🎷

*།།◆️______◆️།།*

आपल्या माहिती विज्ञानाची 🎷 या What's App समूहात सामील होण्यासाठी खालील निळ्या लिंकला 🔗 स्पर्श करा👇

👉 माहिती विज्ञानाची 🎷

➖♾️⭕🔘⭕♾️➖

💫What is a chemical reaction?

A reaction in which a change in reactant or reactants produces a substance with new properties or substances.

In other words, a process in which reactants undergo a change in their chemical properties, resulting in the formation of new substances.

In chemical reactions chemical properties change.

Chemical changes are irreversible.

🔴┈┉❀🏵|🧿|🏵❀┉┈🔴

*།།◆️______◆️།།*

Today we are looking at the types of chemical reactions.

1. Combination Reaction: When two or more reactants combine to form only one product, then it is called a combination reaction.

Ex. 

• Hydrogen reacts with oxygen in the air to form water.

     

2H₂ + O₂ = 2H₂O

• Iron reacts with sulfur to form iron sulphide.

  

Fe + S = FeS

   

Many of us are familiar with the example of two reactants, but many students don't know about 3 reactants.

  

Ex. 

• Carbon dioxide gas is passed through freshly prepared quicklime for a long duration, and then we get calcium bicarbonate, a single product.

    

CaCO₃ + H₂O + CO₂ = Ca(HCO₃)₂

𝄅𝄄*~> ~*✿⃝𝆭⧗⃪ ꯭𝄈𝄅𝄄𝄅🪈꯭

2. Decomposition Reaction: A reaction in which from only one reactant two or more products form is called a decomposition reaction.

Ex. Calcium carbonate 

When heated up to 1000°C, it decomposes into calcium oxide and carbon dioxide. 

    

CaCO₃ = CaO + CO₂

 ✺༺☬༒☬༻✺

3. Displacement Reaction:

When a highly reactive element displaces a less reactive element to form a new product it is called a displacement reaction.

Ex. Zinc displaces copper from copper sulfate solution.

     

Zn + CuSO₄ = ZnSO₄ + Cu

 ┅━═▣◆★✧★◆▣═━┅

4. Double Displacement Reaction: when there is an exchange of ions that takes place in between two reactants to form two new products, and one of them is precipitated, then it is called a double displacement reaction.

In a double displacement reaction, two reactants are two metal salts.

Ex. 

Barium chloride reacts with sodium sulfate to produce barium sulfate and sodium chloride.

     

BaCl₂ + Na₂SO₄ = BaSO₄ + 2NaCl

𝄄*~> ~*✿⃝𝆭⧗⃪ ꯭𝄈𝄅𝄄𝄅🪈꯭

5. Neutralization Reaction: when acid reacts with base to form salt and water, it's called a neutralization reaction.

Ex. Hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water.

    

HCl + NaOH = NaCl + H₂O

☬✧°══✺══°✧☬

6. Exothermic Reaction: At the time of chemical reaction when heat is liberated, then it is called an exothermic reaction.

Ex. Sodium reacts with water to produce sodium hydroxide and hydrogen gas.

     

2Na + 2H₂O = 2NaOH + H₂

In this process too much heat is liberated.

💠💠══✺══💠💠

7. Endothermic Reaction: The reaction in which heat is absorbed is then called an endothermic reaction.

Ex. Sugar, when added in water, absorbs heat.

     

C₁₂H₂₂O_{11 (s)} + H₂O _(l) = C₁₂H₂₂O_{11 (aq)}

*།།◆️___۞___◆️།།*

8. Redox Reaction: A reaction in which oxidation and reduction take place simultaneously; then it is called a redox reaction.

Ex. 

❀꧁✧꧂❀

   

9. Fast Reaction: The reaction that takes a shorter time to complete is called a fast reaction.

Ex. Sodium reacting with water.

10. Slow Reaction: The reaction that takes more time for completion is called a slow reaction.

The reactions between covalent compounds are slow.

Ex. A) Rusting of iron B) Fermentation process 

Fe₂O₃.nH₂O

┗══╰🧿╯══┛

11. Combustion Reaction: A reaction between fuel and oxygen is called a combustion reaction or burning.

In this reaction

Energy is released in the form of light and heat.

Hydrogen and oxygen are reacting to form water.

2H₂ + O₂ = 2H₂O

┈┉━ *❍❀🧿❀❍* ━┉┈       

झालेल्या चुकांवर भर देऊन एकमेकांना दोष देऊन निराशामय वातावरण तयार करण्यापेक्षा...,*

झालेल्या चुकांमधून बोध घेऊन मार्गात बदल करून आशादायी वातावरण तयार करणे कधीही चांगले असते.*       

  

*आपला दिवस आनंदी जावो.*🎷

𝄄*~> ~*✿⃝𝆭⧗⃪ ꯭𝄈𝄅𝄄𝄅🪈꯭